This is a new feature since Tiki3
It allows definition of semantic relationships between wiki pages; i.e. the type of relationship between linked pages. Examples include: state and capital, plural and singular, male and female of the same concept, synonyms , antonyms , acronyms, etc.
Semantic Alias is included in each Tiki install, and you can create your own.
If you are looking to adding structured data to wiki pages, please see: Pretty Tracker
For more information, please see the related pages: